Pre Turbo Injection Recorded Temps 2

[Gelf]

Originally Posted by JohnA

If I had to pick one line to represent ambient (well, airbox!) for all of these graphs, it would have to be the blue one.
Not perfect, but looks less weird than the others.
Except if the mixup happened halfway through the tests. Could that happen?

By the way, that 90degree bend on the high pressure line, is it sold from Aquamist?
Not that I don't find it a bit harsh, I always favour smooth, open turns.

Recorded temps were continuous. Sorry which blue (light or dark)?

Yes, 90dgree bend came from aquamist via interex :smile:

[JohnA]

.

Recorded temps were continuous. Sorry which blue (light or dark)?

Dark blue I'd think

In the "WI off" graph it couldn't be the light blue line, could it?

[Gelf]

After i drove back into town, the temps still being recorded, i stopped for a take away.

Still using all the same format as the above graphs (i havnt swapped the air filter and throttle graph lines over yet).



The steepest temp rise is shown at the air filter, where theres no direct heat source, cant be right can it?, steepest rise should be at the throttle, from the heat transferred from the block through the inlet manifold :?

And then when driving away, the throttle temp drops to ambient within several minutes :?

The reason the IC rises so high is that the transfer pipe where the thermocouple was positioned sits directly above the turbo itself.

[JohnA]

Originally Posted by Gelf

...The steepest temp rise is shown at the air filter, where theres no direct heat source, cant be right can it?, ...

airbox temp would go up, as it will absorb heat radiated from all that hot metal.
There is no air through the bay to cool it down, neither is there airflow through the airbox (which also cools it down)

it's not as bad as the intercooler, because it isn't metal.

[TurboGTi]

Just curious ....are you sure those thermocouples aren't measuring the intercooler pipes also... as the pipes temperature could also rise due to heat soak under the bonnet.

This would clearly give a error in your graphs.

I dunnno just ccurious. :?

[Gelf]

Cracked the problem with the 15 second sample rate now, the equipment samples iniatially at 40 times per second, counts a 1000 samples, then drops to 20 x a second, another 1000 samples and halves again etc etc.

Amazing what you can find out when you read the instruction manual :lol:

If its not raining i will attempt the experiment one more time, this time resseting and recording each jet size on its own.

Recording sessions lasting less than 13 minutes, will give samples at 1.25 per second, and put to bed the doubts of the previous experiment

[JohnA]

Gelf, why don't you try a run or two with the WI starting at higher boost pressure.

What is the max boost of your engine right now?

You see, the WI will be much more effective if it starts when the intercooler is overwhelmed.
It becomes counter-productive when it's activated during the intercooler's sweet spot

You've got the std Z20LET intercooler, right?

[Gelf]

Originally Posted by JohnA

Gelf, why don't you try a run or two with the WI starting at higher boost pressure.

What is the max boost of your engine right now?

You see, the WI will be much more effective if it starts when the intercooler is overwhelmed.
It becomes counter-productive when it's activated during the intercooler's sweet spot

You've got the std Z20LET intercooler, right?

I can hold 15 psi at 3/4 throttle upto about 4.5k rpm, about 11 psi at WOT and over boost of 19 psi between 2.5k and 3.5k rpm

I could trigger one jet at 10 psi and the other at 13psi, but for this experiment i will trigger at 13 psi.

I have an larger after market IC, been thinkin about swapping it for the stock one, less pressure loss - better for top end breathing, if WI is keeping the temps down.

[PuntoRex]

It's funny that I always think larger IC produce less restriction thus less pressure drop.

[Gelf]

Originally Posted by PuntoRex

It's funny that I always think larger IC produce less restriction thus less pressure drop.

The pressure loss of the stock and larger IC have been measured, the stock has a lower pressure drop, but the larger has better temperature drop.

The design of the end tanks of IC's has a lot to do with pressure drops.

The stock IC has better designed end tanks which flow better, but a small surface area core.